0580/43 Oct/Nov 2025, Question 25: Calculating with Bounds
Cambridge IGCSE Mathematics 0580 · Paper 43 (Extended) · Calculator · 3 marks
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The question, in short
Jenna cuts two measured pieces from a 68 cm wire, each measurement given to a stated accuracy. Find the lower and upper bounds for the length of wire left.
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Solution · 3 marks
- 1Bounds: 67.5 to 68.5, 4.65 to 4.75, 9.95 to 10.05
- 2Lower bound = 67.5 − 4.75 − 10.05 = 52.7 cm
- 3Upper bound = 68.5 − 4.65 − 9.95 = 53.9 cm
AnswerLower bound = 52.7, Upper bound = 53.9
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